Decays of the lightest \(Y\)  states, such as \(Y(4230)\)  into \(\gamma /\pi /K + X/Z\) , extensively studied by the BES III Collaboration, have provided precious informations on properties and quantum numbers of the lightest, \(J^P=1^+\)  exotic states (see e.g. [1]}), the latest result being the observation of the first, hidden charm, open strangeness \(Z_{cs}(3985)\) , produced in association with a charged K meson in [2]} (exotic hadrons are extensively reviewed in [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}).
